/*
 * Artificial Intelligence for Humans
 * Volume 3: Deep Learning and Neural Networks
 * Java Version
 * http://www.aifh.org
 * http://www.jeffheaton.com
 *
 * Code repository:
 * https://github.com/jeffheaton/aifh
 *
 * Copyright 2014-2015 by Jeff Heaton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For more information on Heaton Research copyrights, licenses
 * and trademarks visit:
 * http://www.heatonresearch.com/copyright
 */
package com.heatonresearch.aifh.selection;

import com.heatonresearch.aifh.randomize.GenerateRandom;

/**
 * A search axis.
 */
public interface SearchAxis {

    /**
     * Reset the axis back to the beginning.
     */
    void reset();

    /**
     * Advance a position in the search.
     * @return True if there is more to read.
     */
    boolean advance();

    /**
     * The current state of the axis.
     * @return The current value of the axis.
     */
    Object currentState();

    /**
     * Sample a random value from the axis.
     * @param rnd Random number generator.
     * @return The value randomly picked.
     */
    Object sample(GenerateRandom rnd);
}
